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Thread: LAN/WAN lost after upgrade and restart

  1. #1
    Join Date
    Jan 2008
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    LAN/WAN lost after upgrade and restart

    I upgraded my laptop to 13.04 and everything went fine. It restarted and requested a partial upgrade which went well. When starting the computer at home that evening, I was unable to connect to wireless network or use wired connection.
    Being a dual-boot machine, I checked and all the hardware works in Windows.

    The machine connects but I can transfer no data. I tried wifi dongles and had identical result: connection but no data.

    I've spent hours with no success. This makes the machine almost a brick since I work mainly with files in the cloud.

    Here are my results from running wireless_script as mentioned elsewhere in the forums.
    http://pastebin.ubuntu.com/5638525/

    If any additional information is needed, I'm glad to oblige.

  2. #2
    Join Date
    Aug 2005
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    Ubuntu 17.04 Zesty Zapus

    Re: LAN/WAN lost after upgrade and restart

    This is a well-known issue. Please try:
    Code:
    sudo modprobe -r iwlwifi
    sudo modprobe iwlwifi 11n_disable=1
    If it works, let's try to troubleshoot the issue in the router. I have an Intel device using iwlwifi and an N router and mine works perfectly. Therefore, I suspect it's actually a router issue. We'll find out.

    Reference:
    wlan0 IEEE 802.11abgn ESSID:"GBR1"
    Mode:Managed Frequency:2.437 GHz Access Point: xx:D7:19:41:54:xx
    Bit Rate=216 Mb/s Tx-Power=15 dBm
    Retry long limit:7 RTS thr:off Fragment thr:off
    Power Management:off
    Link Quality=58/70 Signal level=-52 dBm
    Last edited by chili555; May 6th, 2013 at 04:10 PM.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  3. #3
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    Re: LAN/WAN lost after upgrade and restart

    When I run
    Code:
    sudo modprobe -r iwlwifi
    I receive
    Code:
    FATAL: Module iwlwifi is in use.

  4. #4
    Join Date
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    Re: LAN/WAN lost after upgrade and restart

    Quote Originally Posted by kfstephensii View Post
    When I run
    Code:
    sudo modprobe -r iwlwifi
    I receive
    Code:
    FATAL: Module iwlwifi is in use.
    Please try:
    Code:
    sudo ifconfig wlan0 down
    sudo modprobe -r iwldvm
    sudo modprobe -r iwlwifi
    sudo modprobe iwlwifi 11n_disable=1
    wlan0 should come right back up; check:
    Code:
    iwconfig
    Now does it connect and pass traffic?
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  5. #5
    Join Date
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    Re: LAN/WAN lost after upgrade and restart

    Here's what I did not the system response:
    Code:
    $ sudo ifconfig wlan0 down
    $ sudo modprobe -r iwldvm
    $ sudo modprobe -r iwlwifi
    Error: missing module name.
    FATAL: Error running remove command for iwlwifi
    $ sudo modprobe iwlwifi 11n_disable=1
    Being at school, I have to open a browser to enter my credentials to access the wifi. I was able to reach the page and do so, being informed that I connected. However, I cannot access any webpages from there or update any cloud drives, weather, ...
    After this, I ran the following:
    Code:
    $ iwconfig
    wmx0      no wireless extensions.
    
    eth0      no wireless extensions.
    
    lo        no wireless extensions.
    
    wlan0     IEEE 802.11abg  ESSID:"HSUOpenRange"  
              Mode:Managed  Frequency:2.412 GHz  Access Point: 00:21:55:B4:6E:F0   
              Bit Rate=36 Mb/s   Tx-Power=15 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Power Management:off
              Link Quality=32/70  Signal level=-78 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:12  Invalid misc:3   Missed beacon:0
    If it is useful to know, I am able to access the network when I boot from the LiveCD.

  6. #6
    Join Date
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    Re: LAN/WAN lost after upgrade and restart

    Please run and pastebin the wireless script again. Also, let us see:
    Code:
    cat /sys/bus/pci/drivers/iwlwifi/module/parameters/11n_disable
    Let's make sure the parameter stuck.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  7. #7
    Join Date
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    Re: LAN/WAN lost after upgrade and restart

    The option did stick:
    Code:
    $ cat /sys/bus/pci/drivers/iwlwifi/module/parameters/11n_disable
    1
    The new results from wireless_script are at: http://pastebin.ubuntu.com/5638816/

  8. #8
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    Re: LAN/WAN lost after upgrade and restart

    Excellent. The parameter is there.

    Here is the only thing I see that's a bit mysterious:
    IPv4 Settings:
    Address: 10.70.3.20
    Prefix: 24 (255.255.255.0)
    Gateway: 10.70.3.254

    DNS: 10.16.1.1
    DNS: 10.16.1.2

    Is the DNS nameserver that the gateway assigned actually reachable?
    Code:
    ping -c3 10.16.1.1
    Can you open web pages by number?
    Code:
    firefox http://173.194.75.99
    Can you ping Google by number?
    Code:
    ping -c3 173.194.75.99
    I suspect a DNS problem.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  9. #9
    Join Date
    Jan 2008
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    Re: LAN/WAN lost after upgrade and restart

    In Chromium, I was able to reach Google using http://173.194.75.99.

    Here are the results from the pings:
    Code:
    kenny:~$ ping -c3 10.16.1.1
    PING 10.16.1.1 (10.16.1.1) 56(84) bytes of data.
    64 bytes from 10.16.1.1: icmp_req=1 ttl=127 time=167 ms
    64 bytes from 10.16.1.1: icmp_req=2 ttl=127 time=1.06 ms
    64 bytes from 10.16.1.1: icmp_req=3 ttl=127 time=1.07 ms
    
    --- 10.16.1.1 ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 2002ms
    rtt min/avg/max/mdev = 1.061/56.467/167.261/78.343 ms
    kenny:~$ ping -c3 173.194.75.99
    PING 173.194.75.99 (173.194.75.99) 56(84) bytes of data.
    64 bytes from 173.194.75.99: icmp_req=1 ttl=44 time=66.6 ms
    64 bytes from 173.194.75.99: icmp_req=2 ttl=44 time=66.3 ms
    64 bytes from 173.194.75.99: icmp_req=3 ttl=44 time=65.4 ms
    
    --- 173.194.75.99 ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 2002ms
    rtt min/avg/max/mdev = 65.466/66.167/66.650/0.588 ms

  10. #10
    Join Date
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    Distro
    Ubuntu 17.04 Zesty Zapus

    Re: LAN/WAN lost after upgrade and restart

    Frankly, I am just a bit stumped. I suspect it has to do with the re-direct to supply your credentials. When you run the live CD, authenticate and then run:
    Code:
    nm-tool
    Are all these settings similar?
    IPv4 Settings:
    Address: 10.70.3.20
    Prefix: 24 (255.255.255.0)
    Gateway: 10.70.3.254

    DNS: 10.16.1.1
    DNS: 10.16.1.2
    Are there any clues, errors, warnings, easter eggs, etc. here?
    Code:
    dmesg | grep -e wlan -e iwl
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

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